Seepage-proof construction method for strata developed in karst caves under overburden

Abstract

The invention discloses an anti-seepage construction method for karst cave development stratum under overburden. The anti-seepage construction method comprises the following steps: S1, overburden drilling with a casing; S2, full-section drilling of basement and karst cave stratum; S3, drill-hole cleaning of basement and karst cave stratum; S4, grouting of basement and karst cave stratum; S5, grouting of overburden; and S6, hole sealing. The anti-seepage construction method has the advantages of simplicity in construction, favorable quality, controllable cost and high efficiency.

Description

technical field [0001] The invention mainly relates to an anti-seepage construction technology for foundations in karst areas, in particular to an anti-seepage construction method for strata with karst caves under a cover layer. Background technique [0002] With the development of water conservancy and hydropower construction, the grouting technology has been developed rapidly, but the theoretical aspects are still being explored, especially the grouting treatment technology in karst areas is still immature. The foundation in the karst area is extremely permeable. When building a dam on the bedrock with developed karst, it is very important to deal with the bedrock of the dam, the surrounding area of ​​the reservoir and the seepage channel in the reservoir area, and the construction technology and construction technology of the treatment are relatively complicated. At present, the anti-seepage treatment construction technologies in domestic karst areas mainly include (quick...

AI Technical Summary

Problems solved by technology

The foundation in the karst area is extremely permeable. When building a dam on the bedrock with developed karst, it is very important to deal with the bedrock of the dam, the surrounding area of ​​the reservoir and the seepage channel in the reservoir area. The construction technology and construction technology of the treatment are relatively complicated

At present, the anti-seepage treatment construction technologies in domestic karst areas mainly include (quick-setting) paste grouting technology, membrane bag grouting technology, high-spray grouting technology in karst caves, concrete grouting technology, orifice sealing method and deep hole curtain grouting technology. There is little practical construction experience in multi-layer karst areas under deep overburden, and the traditional karst anti-seepage technology has the following main disadvantages: 1. The engineering geological conditions are complex, and it is easy to collapse holes, drop drills, and bury drills during drilling. Abnormal conditions, many accidents in the hole, difficult hole formation, high cost of multiple hole making and hole sweeping; 2. The drilling and irrigation equipment is relatively backward, the efficiency of mechanical use and labor is low, and the construction progress is slow; 3. The grouting process is complicated At the same time, the grouting process control requirements are relatively high, the grouting diffusion range is large, the grouting material consumption is large, and the waste is serious

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